2 * Operations on the network namespace
4 #ifndef __NET_NET_NAMESPACE_H
5 #define __NET_NET_NAMESPACE_H
7 #include <linux/atomic.h>
8 #include <linux/workqueue.h>
9 #include <linux/list.h>
10 #include <linux/sysctl.h>
13 #include <net/netns/core.h>
14 #include <net/netns/mib.h>
15 #include <net/netns/unix.h>
16 #include <net/netns/packet.h>
17 #include <net/netns/ipv4.h>
18 #include <net/netns/ipv6.h>
19 #include <net/netns/ieee802154_6lowpan.h>
20 #include <net/netns/sctp.h>
21 #include <net/netns/dccp.h>
22 #include <net/netns/netfilter.h>
23 #include <net/netns/x_tables.h>
24 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
25 #include <net/netns/conntrack.h>
27 #include <net/netns/nftables.h>
28 #include <net/netns/xfrm.h>
29 #include <net/netns/mpls.h>
30 #include <linux/ns_common.h>
31 #include <linux/idr.h>
32 #include <linux/skbuff.h>
34 struct user_namespace;
35 struct proc_dir_entry;
38 struct ctl_table_header;
44 #define NETDEV_HASHBITS 8
45 #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
48 atomic_t passive; /* To decided when the network
49 * namespace should be freed.
51 atomic_t count; /* To decided when the network
52 * namespace should be shut down.
54 spinlock_t rules_mod_lock;
57 atomic64_t cookie_gen;
59 struct list_head list; /* list of network namespaces */
60 struct list_head cleanup_list; /* namespaces on death row */
61 struct list_head exit_list; /* Use only net_mutex */
63 struct user_namespace *user_ns; /* Owning user namespace */
69 struct proc_dir_entry *proc_net;
70 struct proc_dir_entry *proc_net_stat;
73 struct ctl_table_set sysctls;
76 struct sock *rtnl; /* rtnetlink socket */
77 struct sock *genl_sock;
79 struct list_head dev_base_head;
80 struct hlist_head *dev_name_head;
81 struct hlist_head *dev_index_head;
82 unsigned int dev_base_seq; /* protected by rtnl_mutex */
84 unsigned int dev_unreg_count;
87 struct list_head rules_ops;
90 struct net_device *loopback_dev; /* The loopback */
91 struct netns_core core;
93 struct netns_packet packet;
94 struct netns_unix unx;
95 struct netns_ipv4 ipv4;
96 #if IS_ENABLED(CONFIG_IPV6)
97 struct netns_ipv6 ipv6;
99 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
100 struct netns_ieee802154_lowpan ieee802154_lowpan;
102 #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE)
103 struct netns_sctp sctp;
105 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
106 struct netns_dccp dccp;
108 #ifdef CONFIG_NETFILTER
111 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
114 #if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE)
115 struct netns_nftables nft;
117 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
118 struct netns_nf_frag nf_frag;
119 struct ctl_table_header *nf_frag_frags_hdr;
122 struct sock *nfnl_stash;
123 #if IS_ENABLED(CONFIG_NETFILTER_NETLINK_ACCT)
124 struct list_head nfnl_acct_list;
127 #ifdef CONFIG_WEXT_CORE
128 struct sk_buff_head wext_nlevents;
130 struct net_generic __rcu *gen;
132 /* Note : following structs are cache line aligned */
134 struct netns_xfrm xfrm;
136 #if IS_ENABLED(CONFIG_IP_VS)
137 struct netns_ipvs *ipvs;
139 #if IS_ENABLED(CONFIG_MPLS)
140 struct netns_mpls mpls;
142 struct sock *diag_nlsk;
146 #include <linux/seq_file_net.h>
148 /* Init's network namespace */
149 extern struct net init_net;
152 struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns,
153 struct net *old_net);
155 #else /* CONFIG_NET_NS */
156 #include <linux/sched.h>
157 #include <linux/nsproxy.h>
158 static inline struct net *copy_net_ns(unsigned long flags,
159 struct user_namespace *user_ns, struct net *old_net)
161 if (flags & CLONE_NEWNET)
162 return ERR_PTR(-EINVAL);
165 #endif /* CONFIG_NET_NS */
168 extern struct list_head net_namespace_list;
170 struct net *get_net_ns_by_pid(pid_t pid);
171 struct net *get_net_ns_by_fd(int pid);
174 void ipx_register_sysctl(void);
175 void ipx_unregister_sysctl(void);
177 #define ipx_register_sysctl()
178 #define ipx_unregister_sysctl()
182 void __put_net(struct net *net);
184 static inline struct net *get_net(struct net *net)
186 atomic_inc(&net->count);
190 static inline struct net *maybe_get_net(struct net *net)
192 /* Used when we know struct net exists but we
193 * aren't guaranteed a previous reference count
194 * exists. If the reference count is zero this
195 * function fails and returns NULL.
197 if (!atomic_inc_not_zero(&net->count))
202 static inline void put_net(struct net *net)
204 if (atomic_dec_and_test(&net->count))
209 int net_eq(const struct net *net1, const struct net *net2)
214 static inline int check_net(const struct net *net)
216 return atomic_read(&net->count) != 0;
219 void net_drop_ns(void *);
223 static inline struct net *get_net(struct net *net)
228 static inline void put_net(struct net *net)
232 static inline struct net *maybe_get_net(struct net *net)
238 int net_eq(const struct net *net1, const struct net *net2)
243 static inline int check_net(const struct net *net)
248 #define net_drop_ns NULL
258 static inline void write_pnet(possible_net_t *pnet, struct net *net)
265 static inline struct net *read_pnet(const possible_net_t *pnet)
274 #define for_each_net(VAR) \
275 list_for_each_entry(VAR, &net_namespace_list, list)
277 #define for_each_net_rcu(VAR) \
278 list_for_each_entry_rcu(VAR, &net_namespace_list, list)
283 #define __net_initdata
284 #define __net_initconst
286 #define __net_init __init
287 #define __net_exit __exit_refok
288 #define __net_initdata __initdata
289 #define __net_initconst __initconst
292 int peernet2id_alloc(struct net *net, struct net *peer);
293 int peernet2id(struct net *net, struct net *peer);
294 bool peernet_has_id(struct net *net, struct net *peer);
295 struct net *get_net_ns_by_id(struct net *net, int id);
297 struct pernet_operations {
298 struct list_head list;
299 int (*init)(struct net *net);
300 void (*exit)(struct net *net);
301 void (*exit_batch)(struct list_head *net_exit_list);
307 * Use these carefully. If you implement a network device and it
308 * needs per network namespace operations use device pernet operations,
309 * otherwise use pernet subsys operations.
311 * Network interfaces need to be removed from a dying netns _before_
312 * subsys notifiers can be called, as most of the network code cleanup
313 * (which is done from subsys notifiers) runs with the assumption that
314 * dev_remove_pack has been called so no new packets will arrive during
315 * and after the cleanup functions have been called. dev_remove_pack
316 * is not per namespace so instead the guarantee of no more packets
317 * arriving in a network namespace is provided by ensuring that all
318 * network devices and all sockets have left the network namespace
319 * before the cleanup methods are called.
321 * For the longest time the ipv4 icmp code was registered as a pernet
322 * device which caused kernel oops, and panics during network
323 * namespace cleanup. So please don't get this wrong.
325 int register_pernet_subsys(struct pernet_operations *);
326 void unregister_pernet_subsys(struct pernet_operations *);
327 int register_pernet_device(struct pernet_operations *);
328 void unregister_pernet_device(struct pernet_operations *);
331 struct ctl_table_header;
334 int net_sysctl_init(void);
335 struct ctl_table_header *register_net_sysctl(struct net *net, const char *path,
336 struct ctl_table *table);
337 void unregister_net_sysctl_table(struct ctl_table_header *header);
339 static inline int net_sysctl_init(void) { return 0; }
340 static inline struct ctl_table_header *register_net_sysctl(struct net *net,
341 const char *path, struct ctl_table *table)
345 static inline void unregister_net_sysctl_table(struct ctl_table_header *header)
350 static inline int rt_genid_ipv4(struct net *net)
352 return atomic_read(&net->ipv4.rt_genid);
355 static inline void rt_genid_bump_ipv4(struct net *net)
357 atomic_inc(&net->ipv4.rt_genid);
360 extern void (*__fib6_flush_trees)(struct net *net);
361 static inline void rt_genid_bump_ipv6(struct net *net)
363 if (__fib6_flush_trees)
364 __fib6_flush_trees(net);
367 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
368 static inline struct netns_ieee802154_lowpan *
369 net_ieee802154_lowpan(struct net *net)
371 return &net->ieee802154_lowpan;
375 /* For callers who don't really care about whether it's IPv4 or IPv6 */
376 static inline void rt_genid_bump_all(struct net *net)
378 rt_genid_bump_ipv4(net);
379 rt_genid_bump_ipv6(net);
382 static inline int fnhe_genid(struct net *net)
384 return atomic_read(&net->fnhe_genid);
387 static inline void fnhe_genid_bump(struct net *net)
389 atomic_inc(&net->fnhe_genid);
392 #endif /* __NET_NET_NAMESPACE_H */